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Bulletin of the Russian Academy of Sciences Physics

Non-Adiabatic Fast Quantum Memory on an Atom-Resonator System Provided by Optimal Switching on a Control Field

Yu. A. Kharlamova, Арсланов Наркис Мусавирович, Sergey A. Moiseev

Published Dec 1, 2022• 4 citations
Publisher

Abstract

Abstract The efficiency of non-adiabatic quantum memory based on the Raman interaction between a photon and a three-level atom in a high-Q resonator was investigated. The optimum gradual switch-on form of a control field ensures high efficiency of the fast quantum memory is found. Proposals for improving the basic parameters of the considered quantum memory using realistic experimental parameters are shortly disscussed.

DOI
10.3103/s1062873822120139

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Effective multimode photon echo quantum memory on multiatomic ensemble in the QED cavity is proposed. We obtain the analytical solution for the quantum memory efficiency that can be equal to unity when optimal conditions for the cavity and atomic parameters are held. Detailed analysis of the optimal conditions is performed. Numerical estimation for realistic atomic and cavity parameters demonstrates the high efficiency of the quantum memory for an optically thin resonant atomic system that opens a door for real applications.
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Optical quantum memory--the ability to store photonic quantum states and retrieve them on demand--is an essential resource for emerging quantum technologies and photonic quantum information protocols. Simultaneously achieving high efficiency and high-speed, broadband operation is an important task necessary for enabling these applications. In this work, we investigate the optimization of a large class of optical quantum memory protocols based on resonant interaction with ensembles of Λ\LambdaΛ-type level systems with the restriction that the temporal envelope of all optical fields must be Gaussian, which reduces experimental complexity. We show that for overlapping signal and control fields there exists a unique and broadband pulse duration that optimizes the memory efficiency, and that this optimized efficiency can be close to the protocol-independent bound. We further optimize over the control field temporal delay and pulse duration, demonstrating saturation of this efficiency bound over a broad range of pulse durations while clarifying the underlying physics of the quantum memory interaction.